The correct answer is E. Q is T’s son.
P is the brother of Q and R. S is R’s mother. T is P’s father.
We know that P and Q are brothers, and that S is R’s mother. This means that P, Q, and R are all siblings. We also know that T is P’s father. This means that P and T are related by blood.
However, we do not know whether Q is related to T by blood. It is possible that Q is adopted, or that T is not Q’s biological father. Therefore, the statement “Q is T’s son” cannot be definitely true.
The other statements can all be definitely true based on the information given. For example, statement A, “T is Q’s father,” can be definitely true if Q is not adopted and T is Q’s biological father. Statement B, “S is P’s mother,” can be definitely true if P is not adopted and S is P’s biological mother. Statement C, “P is S’s son,” can be definitely true if P is not adopted and S is P’s biological mother. Statement D, “T is S’s husband,” can be definitely true if T and S are married.